<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 200px;
            height: 400px;
            margin-bottom: 10px;
            background-color: pink;
        }
        .ad{
            width: 200px;
            height: 400px;
            background-color: blue;
            position: fixed;
            right: 0;
            top: 20%;
            color: white;
        }
    </style>
</head>
<body>
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
    <div class="box">7</div>
    <div class="box">8</div>
    <div class="box">9</div>
    <div class="box">10</div>
    <div class="ad">这是一个广告区域</div>
</body>
</html>